GLM 5.3 Flash vs O3 Mini
As of Oct 14, 2026, GLM 5.3 Flash leads O3 Mini in 4 of 5 shared categories: Reasoning, Science, Long context, and Abstraction (ARC).
GLM 5.3 Flash
Yes. Yes on Coding (best per dollar); Coding › Agentic (best per dollar). Not the overall leader.
O3 Mini
It used to be. Was SOTA in Reasoning.
| Category | GLM 5.3 Flash | O3 Mini |
|---|---|---|
| General LLM | #30 · #30 in General LLM Margin 20.40816326530613 LMArena leaderboard dataset · Oct 13, 2026 | #7 · #7 in General LLM Margin — LMArena leaderboard dataset · Apr 16, 2025 |
| Reasoning | #26 · #26 in Reasoning Margin 18.493150684931507 LMArena leaderboard dataset · Oct 13, 2026 | #133 · Was SOTA · Reasoning Margin 91.78082191780823 LMArena leaderboard dataset · Oct 13, 2026 |
| Math | #— · Not enough data Margin — LMArena leaderboard dataset · Oct 13, 2026 | #— · Not enough data Margin — LMArena leaderboard dataset · Oct 13, 2026 |
| Science | #34 · #34 in Science Margin — Epoch AI benchmarking hub · Aug 20, 2026 | #76 · #76 in Science Margin — Epoch AI benchmarking hub · Jan 31, 2025 |
| Coding | #10 · #10 in Coding Margin 50 Terminal-Bench Harbor Hub · Oct 6, 2026 | #— · Not enough data Margin — LMArena leaderboard dataset · Oct 13, 2026 |
| Coding › Agentic | #10 · #10 in Coding › Agentic Margin 50 Terminal-Bench Harbor Hub · Oct 6, 2026 | — |
| Coding › Web dev | #22 · #22 in Coding › Web dev Margin 19.626168224299064 LMArena leaderboard dataset · Oct 13, 2026 | — |
| Long context | #30 · #30 in Long context Margin 20.40816326530613 LMArena leaderboard dataset · Oct 13, 2026 | #145 · #145 in Long context Margin 98.63945578231292 LMArena leaderboard dataset · Oct 13, 2026 |
| Vision | #29 · #29 in Vision Margin 86.84210526315789 Epoch AI benchmarking hub · Aug 20, 2026 | — |
| Factuality | #30 · #30 in Factuality Margin 23.13432835820896 LMArena leaderboard dataset · Oct 13, 2026 | #— · Not enough data Margin — Epoch AI benchmarking hub · Jan 31, 2025 |
| Abstraction (ARC) | #14 · #14 in Abstraction (ARC) Margin — Epoch AI benchmarking hub · Aug 20, 2026 | #51 · #51 in Abstraction (ARC) Margin — Epoch AI benchmarking hub · Jan 31, 2025 |
GLM 5.3 Flash: $0.252 per 1M blended tokens.
O3 Mini: $1.9250000000000003 per 1M blended tokens.
GLM 5.3 Flash: open weights.
O3 Mini: closed weights.
General LLM: As of Oct 14, 2026, O3 Mini leads GLM 5.3 Flash in General LLM at #7 against #30.
Reasoning: As of Oct 14, 2026, GLM 5.3 Flash leads O3 Mini in Reasoning at #26 against #133.
Science: As of Oct 14, 2026, GLM 5.3 Flash leads O3 Mini in Science at #34 against #76.
Long context: As of Oct 14, 2026, GLM 5.3 Flash leads O3 Mini in Long context at #30 against #145.
Abstraction (ARC): As of Oct 14, 2026, GLM 5.3 Flash leads O3 Mini in Abstraction (ARC) at #14 against #51.
GLM 5.3 Flash or O3 Mini?
As of Oct 14, 2026, GLM 5.3 Flash leads O3 Mini in 4 of 5 shared categories: Reasoning, Science, Long context, and Abstraction (ARC).
GLM 5.3 Flash or O3 Mini for General LLM?
As of Oct 14, 2026, O3 Mini leads GLM 5.3 Flash in General LLM at #7 against #30.
GLM 5.3 Flash or O3 Mini for Reasoning?
As of Oct 14, 2026, GLM 5.3 Flash leads O3 Mini in Reasoning at #26 against #133.
GLM 5.3 Flash or O3 Mini for Science?
As of Oct 14, 2026, GLM 5.3 Flash leads O3 Mini in Science at #34 against #76.